dentist office scares me more than any of those options. how about an after hours dental emergency. just after you get sedated with gas and those scissor things are inserted into your mouth to keep it open, a sliver of moonlight crosses the room and the dentist turns into a werewolf. he leaves you there, immobilized in the chair with the door wide open while he's off cavortin'. various unsavory passersby come into the open office and discuss what they're gonna do with you and to you while they take hits on laughing gas and pop whatever pills they can find. they eventually pass out and so do you. no idea how it ends or what comes next.